Ruby Unzip String - ruby

Question

I have to work with a zipped (regular Zip) string in Ruby.
Apparently I can't save a temporary file with Ruby-Zip or Zip-Ruby.
Is there any practicable way to unzip this string?

Answer 1

rubyzip supports StringIO since version 1.1.0
require "zip"
# zip is the string with the zipped contents
Zip::InputStream.open(StringIO.new(zip)) do |io|
while (entry = io.get_next_entry)
puts "#{entry.name}: '#{io.read}'"
end
end

Answer 2

See Zip/Ruby Zip::Archive.open_buffer(...):
require 'zipruby'
Zip::Archive.open_buffer(str) do |archive|
archive.each do |entry|
entry.name
entry.read
end
end

Answer 3

As the Ruby-Zip seems to lack support of reading/writing to IO objects, you can fake File.
What you can do is the following:
Create a class called File under Zip module which inherits from StringIO, e.g. class Zip::File < StringIO
Create the exists? class method (returns true)
Create the open class method (yields the StringIO to the block)
Stub close instance method (if needed)
Perhaps it'll need more fake methods

Answer 4

As #Roman mentions, rubyzip currently lacks reading and writing of IO objects (including StringIO.new(s)). Try using zipruby instead, like this:
gem install zipruby
require 'zipruby'
# Given a string in zip format, return a hash where
# each key is an zip archive entry name and each
# value is the un-zipped contents of the entry
def unzip(zipfile)
{}.tap do |h|
Zip::Archive.open_buffer(zipfile) do |archive|
archive.each {|entry| h[entry.name] = entry.read }
end
end
end

Answer 5

The zlib library. Works fine with StringIO.